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Text Translation API

Translate text using the GPT Translator API.

Endpoint​

POST https://api.gpttranslator.co/v1/translation/text-translation/api

Authentication​

Add your API key in request headers:

x-api-key: YOUR_API_KEY
Content-Type: application/json

Request Body​

Required fields:

  • text string: Source text to translate
  • sourceLang string: Source language code
  • targetLang string: Target language code
  • model string: Translation model name

Optional fields:

  • domain string: Domain specialization
  • writingStyle string: Writing style preference
  • tone string: Tone preference
  • customPrompt string: Custom translation instructions

Language codes are documented separately in Supported Languages. Supported models are documented in Supported Models.

Validation Rules​

  • text: Required. Cannot be empty.
  • sourceLang, targetLang: Must match ^[a-zA-Z]+(-[a-zA-Z]+)?$, min 2 chars, max 11 chars. Must be a code from Supported Languages.
  • model: Must be one of the values in Supported Models.

Examples​

cURL​

curl --location 'https://api.gpttranslator.co/v1/translation/text-translation/api' \
  --header 'x-api-key: YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
    "text": "hello world",
    "sourceLang": "en",
    "targetLang": "fr",
    "model": "gpt-4.1-mini-2025-04-14"
  }'

JavaScript​

const response = await fetch(
  "https://api.gpttranslator.co/v1/translation/text-translation/api",
  {
    method: "POST",
    headers: {
      "x-api-key": "YOUR_API_KEY",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      text: "hello world",
      sourceLang: "en",
      targetLang: "fr",
      model: "gpt-4.1-mini-2025-04-14",
    }),
  },
);

const data = await response.json();
console.log(data);

Python​

import requests

url = "https://api.gpttranslator.co/v1/translation/text-translation/api"
headers = {
    "x-api-key": "YOUR_API_KEY",
    "Content-Type": "application/json"
}
payload = {
    "text": "hello world",
    "sourceLang": "en",
    "targetLang": "fr",
    "model": "gpt-4.1-mini-2025-04-14"
}

response = requests.post(url, headers=headers, json=payload)
print(response.json())

Response Types​

Success 200​

{
  "message": "Text translation completed successfully",
  "error": null,
  "data": {
    "translatedText": "bonjour le monde",
    "originalText": "hello world",
    "totalWords": 2,
    "isRTL": false,
    "tokensConsumed": 3
  },
  "statusCode": 200
}

Request Validation Error 400​

Validation middleware errors are returned in this format:

{
  "error": "Invalid source language. Please select a supported language."
}

Other possible validation errors:

  • Invalid target language. Please select a supported language.
  • Invalid model type. Please enter a valid model type e.g. ...
  • Text cannot be empty.
  • Text is required.

API Key Missing/Invalid Header 401​

{
  "message": "Invalid api key",
  "error": "Invalid api key",
  "statusCode": 401,
  "data": null
}

API Key or User Setup Errors 400​

Invalid key in database:

{
  "message": "Invalid api key",
  "error": "Invalid api key",
  "statusCode": 400,
  "data": null
}

User not active:

{
  "message": "User not found or user is not active",
  "error": "User not found or user is not active",
  "statusCode": 400,
  "data": null
}

Organization missing:

{
  "message": "Organization Id not found for the user",
  "error": "Organization Id not found for the user",
  "statusCode": 400,
  "data": null
}

Plan Restriction 402​

{
  "message": "only subscribed users are allowed to use this model",
  "error": "only subscribed users are allowed to use this model",
  "data": null,
  "statusCode": 402
}

Token Limit Reached 402​

{
  "message": "You have reached the limit of words for translation. Please upgrade your plan to continue using this feature.",
  "error": "You have reached the limit of words for translation. Please upgrade your plan to continue using this feature.",
  "data": {
    "requiredTokens": 123,
    "tokens": 45
  },
  "statusCode": 402
}

Processing/Server Error 500​

{
  "message": "Error in text translation for api",
  "error": "Detailed server error message",
  "data": null,
  "statusCode": 500
}